Feels like sleeping through the night is never going to happen, yeah?

I don't think moving her will make much difference to her but to you it sure will! If she's waking then you will be off to the other end of the house with the added stress of getting there before she wakes her sister. It might surprise you, DD sleeps through DS's wake ups here, but their rooms aren't close.

DS is 15 months and still wakes between 2-4 times in a 10 hour period. I learnt from DD that it doesn't matter how hard you try, some of them just wont sleep through until their developmentally capable. Honestly, while it is exhausting I have found the quickest way to get back to bed is to just do what needs to be done to get them back to sleep! In our house unfortunately that's a feed. So yup, 15 month old still feeding 2-4 times a night he refuses any 'comforters'.

Hopefully once those teeth pop through she will be far more settled and you can move her to her own room (if you want) and you get some more rest